use proper functions to get typing origin, args

use proper functions to get typing origin, args

Fixed regression caused by issue :ticket:`11814` which broke support for
certain flavors of :pep:`593` ``Annotated`` in the type_annotation_map when
builtin types such as ``list``, ``dict`` were used without an element type.
While this is an incomplete style of typing, these types nonetheless
previously would be located in the type_annotation_map correctly.

Fixes: #11831
Change-Id: I6ea7fc1bce462d44ffcf67ef18b60050dfc2c91e